RESEARCH: QBaB over small samples—Exit Velocity


Last year we introduced QBaB, a letter grade that succinctly summarizes a batter’s batted ball quality over a season. We showed, among other things, that QBaB scores are well-correlated with positive outcomes, that they don’t change much from season to season, and that batters who underperform or overperform their QBaB tend to regress strongly toward the mean that is consistent with their score.

But what about in sample sizes smaller than a season? Today, we’ll see what we can do with less information.

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  For more information about the terms used in this article, see our Glossary Primer.